129920112 has 100 divisors (see below), whose sum is σ = 429774576. Its totient is φ = 37117440.

The previous prime is 129920107. The next prime is 129920117. The reversal of 129920112 is 211029921.

It is an interprime number because it is at equal distance from previous prime (129920107) and next prime (129920117).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129920117) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1912 + ... + 16232.

Almost surely, 2^129920112 is an apocalyptic number.

129920112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129920112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214887288).

129920112 is an abundant number, since it is smaller than the sum of its proper divisors (299854464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129920112 is a wasteful number, since it uses less digits than its factorization.

129920112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14348 (or 14333 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 129920112 is about 11398.2503920558. The cubic root of 129920112 is about 506.4759123411.

The spelling of 129920112 in words is "one hundred twenty-nine million, nine hundred twenty thousand, one hundred twelve".